JP2020028071A - Cable and image reading device - Google Patents

Abstract

To provide a cable and an image reading device capable of suppressing contact of a cable electrically connecting a moving body moving in a moving direction with a control board fixed at a fixed position to another member.SOLUTION: In a cable having one end connected to a moving body so as to move with a moving body and the other end connected to a fixed body that does not move, a folding portion is provided that is folded such that a mountain fold and a valley fold are alternately repeated in a bending portion where a cable bends so as to be able to expand and contract in the moving direction of the moving body.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cable and an image reading device.

  A document table on which the document is placed in the document placing area, a unit that moves in the direction of movement along the document table when reading the image of the document, and a cable that electrically connects the unit and the electrical board. The cable is disposed so as to straddle a document placing area and a region outside the document placing area in a direction perpendicular to the moving direction and along the document table, 2. Description of the Related Art There is known an image reading apparatus in which a contact prevention member for preventing a cable and a document table from coming into contact with each other is provided in a region outside a mounting region (Patent Document 1).

  A light source for illuminating the original, a scanning optical system for forming an image of reflected light from the original as image light, a carriage moving at a constant scanning speed with respect to the original, and one end connected to the carriage; A flexible flat cable for transmitting signals and power to and from the main body, a main body side fixing portion for fixing the vicinity of the other end of the flexible flat cable to the apparatus main body, and a flexible flat cable near the main body side fixing portion. There is also known an image reading apparatus provided with a mountain-folded portion (Patent Document 2).

JP 2009-205107 A JP 2011-30032 A

  The present invention provides a cable and an image reading apparatus that can suppress contact of a cable that electrically connects a moving body that moves in a movement direction with a control board fixed at a fixed position to another member.

In order to solve the problem, the cable according to claim 1 is
A cable connected to the moving body so that one end moves together with the moving body, and the other end is connected to a fixed body that does not move,
A bending portion is provided in a bending portion where the cable bends,
It is characterized by the following.

According to a second aspect of the present invention, in the cable according to the first aspect,
The bent portion is bent obliquely upward in the vertical direction from the virtual center of the bending portion,
It is characterized by the following.

According to a third aspect of the present invention, in the cable according to the second aspect,
The bent portion is bent such that the lower side in the vertical direction of the cable is closer to the virtual center of the curved portion,
It is characterized by the following.

According to a fourth aspect of the present invention, in the cable according to the first aspect,
The bending portion is provided in the bending portion having a maximum curvature with the movement of the moving body,
It is characterized by the following.

According to a fifth aspect of the present invention, in the cable according to the first aspect,
The bent portion is provided on a part of the curved portion when the curved portion is closest to another member that may be in contact with the cable disposed on the casing that supports the moving body and the fixed body. Have been
It is characterized by the following.

According to a sixth aspect of the present invention, in the cable according to the first aspect,
The bent portion is provided at a position closer to the fixed portion than the moving body,
It is characterized by the following.

According to a seventh aspect of the present invention, in the cable according to any one of the first to sixth aspects,
The bent portion is formed so as to be able to expand and contract in the movement direction of the moving body by being repeatedly alternately repeated mountain folds and valley folds,
It is characterized by the following.

The invention according to claim 8 is the cable according to any one of claims 1 to 7,
The cable is arranged so as to face a vertical direction,
It is characterized by the following.

The invention according to claim 9 is the cable according to any one of claims 1 to 8,
The cable is a flexible flat cable,
It is characterized by the following.

In order to solve the above problem, the image reading device according to claim 10,
A reading unit that moves in the sub-scanning direction and reads an image;
The cable according to any one of claims 1 to 9, wherein one end is connected to the image reading means so as to move together with the image reading means, and the other end is connected to a control board which does not move. With,
It is characterized by the following.

  According to the first aspect of the present invention, it is possible to suppress the cable from coming into contact with another member as the moving body moves.

  According to the second aspect of the present invention, it is possible to secure a distance from another member that may be in contact with the cable.

  According to the third aspect of the present invention, there is a possibility that the cable may be located at a position separated from the virtual center on the lower side in the vertical direction of the cable than when the cable is bent so that the upper side in the vertical direction is closer to the virtual center. Contact with other members can be suppressed.

  According to the invention as set forth in claim 4, when the cable is likely to contact another member, it is possible to suppress the cable from contacting another member.

  According to the invention described in claim 5, when the cable is likely to contact another member, the contact of the cable with another member can be suppressed.

  According to the invention as set forth in claim 6, it is possible to suppress the cable from coming into contact with other members in the portion where the curve of the cable becomes large.

  According to the seventh aspect of the present invention, it is possible to reduce the bending of the bending portion without increasing the overall length of the cable.

  According to the invention described in claim 8, contact of the cable with other members can be suppressed.

"
According to the ninth aspect of the present invention, it is possible to electrically connect the moving body that moves and the fixed body that does not move.

  According to the tenth aspect of the present invention, the cable for electrically connecting the image reading means moving in the moving direction and the control board fixed at the fixed position is another member as the image reading means moves. Can be suppressed.

FIG. 2 is a schematic cross-sectional view showing an internal structure of the image reading device 1. FIG. 2A is a schematic vertical cross-sectional view illustrating a cable connection structure of the image reading apparatus, and FIG. (A) is a figure which shows the main plane of FFC, (b) is a figure which shows the bending part of FFC. (A) is a figure which shows the laying state of FFC when a carriage is located in the left end, (b) is a figure which shows the laying state of FFC when a carriage is moving. (A) is a perspective view showing a curved portion of the FFC, and (b) is a diagram showing a position of the FFC in the direction of gravity. FIG. 5 is a diagram illustrating an laid state of the FFC when the carriage is located at the left end. FIG. 4 is a diagram illustrating an laying state of the FFC when the carriage is moving. FIG. 5 is a diagram illustrating an laying state of the FFC when the carriage is located at the right end. (A) is a perspective view showing a curved part of an FFC of a comparative example which does not have a bent part in a curved part, and (b) is a figure explaining hanging of the FFC in the direction of gravity.

Next, the present invention will be described in more detail with reference to the drawings and embodiments and specific examples below, but the present invention is not limited to these embodiments and specific examples.
Also, in the following description using the drawings, it should be noted that the drawings are schematic and ratios of respective dimensions and the like are different from actual ones. Illustrations other than members are omitted as appropriate.

(1) Configuration and Operation of Image Reading Apparatus 1 FIG. 1 is a schematic sectional view showing the internal structure of the image reading apparatus 1.
The image reading apparatus 1 has a platen glass 22 on which an original S is placed on an upper surface of a housing 21 and is provided inside the housing 21 so as to be capable of reciprocating in a sub-scanning direction (horizontal direction: X direction). Carriage 24 is arranged.

On the housing 21, a platen cover 23 for holding a document that covers the platen glass 22 so as to be openable and closable is attached to be able to open and close.
One end of the platen cover 23 is supported by a hinge or the like, and a document holding cushion 23a made of a white plate or the like is provided on one surface side of the platen cover 23. The document holding cushion 23a is placed on the platen glass 22 in a closed state. The original S is pressed from above.

Below the platen glass 22, a carriage 24 as an example of a moving body that reads the original S while moving the reading surface on the platen glass 22 is arranged.
On the carriage 24, a lamp H for irradiating the original S on the platen glass 22, an imaging lens L for forming an image of reflected light from the original S at a predetermined magnification, and an image sensor (solid-state image sensor using CMOS) 25 are provided. It is installed. The image sensor 25 serves as a reading sensor for reading an image on the document S, and generates an analog image signal corresponding to light reflected from the document S.

  When the original S is placed on the platen glass 22, the carriage 24 is sequentially moved in the sub-scanning direction (X direction) to read the image information line by line so that the reflected light from the original S The image is guided to the sensor 25 to read the image of the entire document S.

  A control board PCB (not shown in FIG. 1, see FIG. 2) as an example of a fixed body is provided at a rear central portion of the housing 21, and a carriage 24 is provided via a flexible flat cable described later as an example of a cable. And performs predetermined signal processing on the electric signal obtained by the operation control of the carriage 24 and the image sensor 25.

(2) Cable connection structure of image reading device 1 FIG. 2A is a schematic vertical cross-sectional view illustrating the cable connection structure of image reading device 1, FIG. 2B is a schematic cross-sectional diagram, and FIG. FIG. 7 is a diagram showing the laying state of the FFC when it is located, FIG. 7 is a diagram showing the laying state of the FFC when the carriage 24 is moving, and FIG. 8 is a diagram showing the laying state of the FFC when the carriage 24 is located at the right end. FIG.

(2.1) Curved portion of flexible flat cable In the image reading device 1, when the carriage 24 is driven in the sub-scanning direction (X direction), a relative displacement occurs between the control board PCB and the carriage 24. Therefore, a control circuit (not shown) on the control board PCB and the carriage 24 are connected by a flexible flat cable (hereinafter, referred to as “FFC”) that allows a relative displacement between them.

  As shown in FIG. 2, one end of the FFC is connected to a board (not shown) of the carriage 24 from one side of the carriage 24 by a connector, and the other end secures a length necessary for movement of the carriage 24 and forms a loop. It is connected to the control board PCB in a curved state.

  As described above, when the carriage 24 moves in a state where the reciprocally movable carriage 24 and the control board PCB fixedly arranged on the housing 21 are connected by the flexible FFC, the relative movement between the carriage 24 and the control board PCB is made. Since the position changes, the loop state of the FFC changes depending on the position of the carriage 24.

  When the carriage 24 is positioned at the left end (−X direction) (CVT reading position: moving a document to read an image), as shown in FIG. 6, the relative distance L1 between the carriage 24 and the control board PCB is the largest. That is, the loop-shaped curved portion W1 formed in the FFC becomes smaller (see the distance R1 from the virtual center C of the loop in the curved portion W1 to the curved portion W1).

  When the carriage 24 moves (reads) in the sub-scanning direction (X direction), as shown in FIG. 7, the relative distance L2 between the carriage 24 and the control board PCB is reduced, and the loop-shaped curved portion formed on the FFC is formed. W2 increases (see the distance R2 from the virtual center C of the loop in the curved portion W2 to the curved portion W2).

  Then, as shown in FIG. 8, when the carriage 24 further moves in the sub-scanning direction (X direction), the relative distance L3 between the carriage 24 and the control board PCB increases, and a loop-shaped curved portion W3 formed on the FFC is formed. Becomes smaller (see the distance R3 from the virtual center C of the loop in the curved portion W3 to the curved portion W3).

(2.2) Flexible Flat Cable of Comparative Example FIG. 9A is a perspective view showing a curved portion of the FFC of the comparative example having no bent portion in the curved portion W0, and FIG. FIG.
When the carriage 24 and the control board PCB are connected to each other by the FFC having no bent portion to the curved portion W0, the carriage 24 moves in the sub-scanning direction (X direction), and the curved portion W0 becomes larger (curved portion W0). The distance R0 from the virtual center of the loop in the portion W0 to the curved portion W0), and the curved portion W0 greatly expands in a loop toward the moving carriage 24.

As described above, in a state where the curved portion W0 is greatly expanded, even if the main plane of the FFC is laid so as to intersect the vertical direction and the rigidity in the vertical direction is increased, the curved portion W0 is connected to the connection portion of the control board PCB. , And hang down vertically (-Z direction) by the action of gravity (see G in the figure) (see FIG. 9B).
When the curved portion W0 hangs vertically downward (−Z direction), at the time of image reading, the lower end of the FFC and a part of the bottom surface 21a of the housing 21 as an example of another member in the present embodiment come into contact with each other, and abnormal noise is generated. There was a risk of occurrence.

Here, as shown in FIG. 5B, since the bottom surface 21a protrudes slightly vertically (Z direction) from the lowest part of the housing 21 of the image reading apparatus 1, even if the FFC hangs down. It is not located where it does not touch.
In the present embodiment, the bottom surface 21a protrudes vertically upward (Z direction) from the lowest portion over the entire moving direction of the reciprocating movement of the carriage 24, but is not limited to such a configuration. A configuration in which a part is protruded may be used. In that case, it is preferable to form a later-described bent portion F in a portion where the protruding bottom surface 21a is arranged in a reciprocating direction and in a portion where the FFC is curved.

(2.3) Connection Structure of Flexible Flat Cable FIG. 3A is a diagram illustrating a main plane of the FFC according to the present embodiment, FIG. 3B is a diagram illustrating a bent portion F of the FFC, and FIG. FIG. 5B is a diagram showing the laying state of the FFC when the carriage 24 is moving, FIG. 5A is a diagram showing the laying state of the FFC when the carriage 24 is moving, and FIG. FIG. 3B is a perspective view illustrating a position of the FFC in the direction of gravity.

The FFC has a bent portion F at a portion which becomes the curved portion W in a state where the reciprocally movable carriage 24 is connected to the control board PCB whose position is fixed to form a loop-shaped curved portion W.
As shown in FIG. 3A, the bent portion F is inclined at 45 degrees toward one end FFC0 connected to the carriage 24, and is provided with a mountain-folded portion F1 and a valley-folded portion F2 alternately and repeatedly. As shown in FIG. 3B, the carriage 24 can expand and contract with the reciprocation of the carriage 24.

  When the carriage 24 is located at the left end (−X direction) (CVT reading), as shown in FIG. 4A, the relative distance L1 between the carriage 24 and the control board PCB is the largest, and the bent portion F is folded in a mountain. The portion F1 and the valley-folding portion F2 expand and the loop-shaped curved portion W1 formed in the FFC becomes smaller (see the distance R1 from the virtual center C of the loop in the curved portion W1 to the curved portion W1).

When the carriage 24 moves (reads) in the sub-scanning direction (X direction), as shown in FIG. 4B, the relative distance L2 between the carriage 24 and the control board PCB becomes small, and a loop formed on the FFC is formed. Is larger (see the distance R2 from the virtual center C of the loop in the curved portion W2 to the curved portion W2).
When the bending portion W2 is the largest, the bent portion F is formed at a position closer to the control board PCB than the carriage 24, at a portion of the bending portion W2 that greatly expands toward the carriage 24.

As shown in FIG. 5, the bent portion F is formed by alternately repeating a mountain-folded portion F1 and a valley-folded portion F2 diagonally upward from a virtual center C of the curved portion W2 in a vertical direction (Z direction). In W2, the beam length of the cantilever having the connection portion of the control board PCB as a base end is shorter than that of the comparative example.
Therefore, the gravitational force acting on the curved portion W2 (see G in FIG. 5) is smaller than in the comparative example, and the amount of sag vertically downward (−Z direction) is reduced. As a result, as shown in FIG. 5B, the downward bending of the curved portion W <b> 2 (−Z direction) is suppressed, and the distance D between the lower end of the FFC and the bottom surface 21 a of the housing 21 is secured to make contact. Can be suppressed.

  When viewed from the lower side in the vertical direction (-Z direction) of the curved portion W2, the bent portion R is arranged such that the vertical lower end of the FFC is closer to the virtual center C of the curved portion W2 as shown in FIG. The folded portion F1 and the folded portion F2 are alternately and repeatedly formed, and the curved portion W2 has a shorter beam length of the cantilever having the base end of the connection portion of the control board PCB as compared with the comparative example. As a result, the distance D between the lower end of the FFC and the bottom surface of the housing 21 is ensured, as compared with the case where the upper side in the vertical direction (Z direction) of the FFC is bent so as to be closer to the virtual center C of the curved portion W2. Contact can be suppressed.

As described above, the embodiments of the present invention have been described with specific examples. However, the technical scope of the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention. It is possible.
For example, although an example has been described in which the FFC suppresses contact with the bottom surface 21a of the housing 21, the FFC contacts from a direction parallel to or oblique to the surface of a member projecting vertically (Z direction) from the bottom surface of the carriage 24. This can be applied to the case where the operation is suppressed.

DESCRIPTION OF SYMBOLS 1 ... Image reading apparatus 21 ... Housing 22 ... Platen glass 23 ... Platen cover 24 ... Carriage 25 ... Image sensor FFC ... Flexible flat cable PCB ... Control board W , W0, W1, W2: curved portion F: bent portion

Claims (10)

A cable connected to the moving body so that one end moves together with the moving body, and the other end is connected to a fixed body that does not move,
A bending portion is provided in a bending portion where the cable bends,
A cable characterized in that: The bent portion is bent obliquely upward in the vertical direction from the virtual center of the bending portion,
The cable according to claim 1, wherein: The bent portion is bent such that the lower side in the vertical direction of the cable is closer to the virtual center of the curved portion,
The cable according to claim 2, wherein: The bending portion is provided in the bending portion having a maximum curvature with the movement of the moving body,
The cable according to claim 1, wherein: The bent portion is provided on a part of the curved portion when the curved portion is closest to another member that may be in contact with the cable disposed on the casing that supports the moving body and the fixed body. Have been
The cable according to claim 1, wherein: The bent portion is provided at a position closer to the fixed portion than the moving body,
The cable according to claim 1, wherein: The bent portion is formed so as to be able to expand and contract in the movement direction of the moving body by being repeatedly alternately repeated mountain folds and valley folds,
The cable according to any one of claims 1 to 6, wherein: The cable is arranged so as to face a vertical direction,
The cable according to any one of claims 1 to 7, wherein: The cable is a flexible flat cable,
The cable according to any one of claims 1 to 8, wherein: A reading unit that moves in the sub-scanning direction and reads an image;
The cable according to any one of claims 1 to 9, wherein one end is connected to the image reading means so as to move together with the image reading means, and the other end is connected to a control board which does not move. With,
An image reading apparatus comprising:

Images